生物质固体燃料成型机压辊磨损失效分析

针对生物质固体燃料成型机在加工成型燃料过程中，关键部件环模和压辊磨损后导致使用寿命短、影响生产率等问题，该文对压辊进行磨损试验研究，该压辊采用45钢渗碳处理，渗碳层深度3 mm，在实际生产工况下工作200 h。由于原料中的硅酸盐成分、杂质、喂料的不均匀以及原料中水分影响加剧压辊表面的磨损，致使压辊快速磨损失效。磨损后利用S-570扫描电镜观察其磨损形貌，探究压辊失效的磨损机理。结果表明，靠近喂料一侧压辊表面磨损严重，磨损量4.2 mm左右，比其他位置表面的磨损量多1.2 mm。磨损机理主要是黏着磨损和磨粒磨损，磨损面已接近渗碳层与基体交界处，并且磨损面存在应力腐蚀裂纹。

Wear failure analysis on roller assembly of biomass pellet mill

Wear trial of roller assembly was carried out to solve the problem with which the key accessory of HM485 biomass pellet mill, e.g. die and roller, was abraded so that decreased the work life and productivity during produce densified biofuel. In this study, the roller assembly was manufactured by steel 45 with carburization treatment and the carburized layer depth was 3 mm, and the working life was 200 hours. The roller assembly was rapid abraded and became wear failure because of silicate minerals, impurities and moisture in raw materials. The principle of wear failure was studied with S-570 scanning electron microscope, the results showed that the wear depth of roller assembly which closed the feed side was up to 4.2 mm, and it was deeper 1.2 mm than other sides. The principle of wear failure is mainly adhesive wear and abrasive wear, and there is stress corrosion cracking in the abrasion surface which is close with the junction of carburized layer and substrate.